Emac Ram Help

my girlfriend has an emac, and she came across a stick of 512mb sdram for it...we plug it in and we get a single beep tone stating that the memory is unreconized.
she got a stick of infineon ram, the stick on it reads

i stick this ram into my PC computer cause i have a powerbook myself and it works just fine...not that i dont mind an extra 512 in my pc but she really needs it when she only has 256mb... can anyone lend a hand....and info ... is this sd ram not compatiable ????

well your wrong about the speed...cause what it shipped with was 128mb 133mhz ram, and i added an additional 128mb 133 and everything works fine..so the 512 stick i have should in theory work...i think it might have to many chips on it for the mac to understand.

as far as the slots i have tried changing that..i noticed that was well when i added the other 128mb, but it gave a 2 beep error code sometimes...but when i stick in the 512mb card in both slots by its self i get a single beep code.